Process for waterproofing materials having a fibrous structure a

Details Process for waterproofing materials having a fibrous structure a Process for waterproofing materials having a fibrous structure a

1995-02-08

1997-11-11

Green, Anthony

Compositions

Leather or fur treating

8 941R, 8 9413, 8 9414, 8 9419R, 8 942, 8 9421, 8 9422, 8 9433, C14C 902

Patent

active

056860110

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to the waterproofing of materials having a fibrous structure, in particular leather, fur skins, leather substitutes, by using waterproofing agents containing sulfosuccinic acid esters. The invention further relates to waterproofing agents for carrying out the process. Owing to their mild surfactant character (good dermatologic compatibility), sulfosuccinic acid esters find increasing use in shampoos, foam baths and cosmetics (personal care products) where their good emulsifying action, high foaming ability and good detergent, i.e., wetting action is selectively used in general.
The use of sulfosuccinates in the leather manufacture is described in DE-OS 16 69 347 and DE-OS 34 19 405, claiming their use as fatliquors and greases in the main fatliquoring and in tanning and retanning.
According to DE-OS 35 07 241 the emulsifying properties of sulfosuccinic acid monoesters in combination with impregnating and/or waterproofing fatliquors and greases are utilized to achieve water-repellent properties of the treated leather; a subsequent fixation with chromium and/or aluminum salts is carried out resulting in a conversion of the hydrophilic w/o-emulsifier into hydrophobic metal complex salts. The additional use of sulfosuccinic acid monoesters in the impregnating and/or waterproofing fatliquoring serves an intentional stability increase of the fatliquoring emulsion. In addition to the impregnating fatliquors and greases of the group consisting of oxidized or oxidized and partially sulfonated C.sub.18-26 -hydrocarbons or C.sub.32-40 -waxes, phosphoric acid mono-C.sub.12-24 -alkyl esters, partial esters of polycarboxylic acids, such as citric acid-C.sub.16-24 -alkyl ester, partial esters of polyalcohols, such as sorb and pentaerythritoI-C.sub.16-24 -fatty acid esters, both untreated oils (neutral oils), such as long-chain hydrocarbons, chlorinated paraffin, animal and vegetable oils and fats or their methyl esters and chlorinated fatty acid methyl esters, and sulfated, sulfited, and/or synthetic fatliquors and greases based on chlorinated paraffin sulfonates may be emulsified or stabilized.
An improvement of the waterproofing action, as against the last-mentioned process, can substantially be achieved by substituting the sulfosuccinic acid monoesters for sulfosuccinic acid monoamides. However, the compulsory subsequent fixation using chromium, aluminum, titanium and/or zirconium salts is still a disadvantage of this process which is described in DE-OS 36 20 780. In practice, this fixation is mainly carried out by using chromium salts.
It is known by EP 02 13 480 that the hydrophobing of leather and furs is effected with a silicone oil and the salt of an N-(C.sub.9 -C.sub.20 -acyl) amino acid used as emulsifier, wherein optional post-treatment with a metallic salt commonly used in tanning may follow. However, it was found that the omission of the metallic salt fixation leads to insufficient waterproofing results.
In many countries the regulations with respect to the chromium content in waste water are becoming increasingly tight. As is generally known, a considerable portion of the conventionally used chrome-tanning material is not bound by the leather fiber and for this reason comes into the waste water through washing and rinsing processes. Although this portion is lower when highly exhausting chrome tanning agents are used, it is still above the required and very low values in practice.
Additionally, a process for waterproofing leathers, fur skins and leather substitutes using a carboxyl groups-containing polysiloxane whose carboxyl groups are present in neutralized form is described in EP 03 24 345. This process is conducted in the absence of emulsifiers and without aftertreatment using mineral tanning agents.
Accordingly, it is the object of the present invention to provide substances and procedures which, when applied from the aqueous float, result in waterproof leathers, without having to conduct a subsequent treatment with mineral salts in order to avoid the above-mentioned waste

REFERENCES:
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patent: 4554339 (1985-11-01), Hockemeyer et al.
patent: 4597987 (1986-07-01), Hockemeyer et al.
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patent: 4799932 (1989-01-01), Friese et al.
patent: 5151473 (1992-09-01), Herzig
Luvisi et al, "Alkenyl Succinic Acid-Silicone Systems for Water Resistant Leather", The Journal of the American Leather Chemists Association, vol. LXI, No. 11, pp. 585-593, Nov. 1966.
Silicone Chemie und Technologie (Silicone Chemistry and Technology), Vulkan-Verlag Essen (1989), pp. 86-89 (no month).

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